DynASM: Fix regression due to warning fix.

Thanks to Dmitry Stogov. #1041 #970

dynasm/dasm_arm.h

@@ -142,6 +142,7 @@ void dasm_setup(Dst_DECL, const void *actionlist)
   if (D->pclabels) memset((void *)D->pclabels, 0, D->pcsize);
   for (i = 0; i < D->maxsection; i++) {
     D->sections[i].pos = DASM_SEC2POS(i);
+    D->sections[i].rbuf = D->sections[i].buf - D->sections[i].pos;
     D->sections[i].ofs = 0;
   }
 }

dynasm/dasm_arm64.h

@@ -144,6 +144,7 @@ void dasm_setup(Dst_DECL, const void *actionlist)
   if (D->pclabels) memset((void *)D->pclabels, 0, D->pcsize);
   for (i = 0; i < D->maxsection; i++) {
     D->sections[i].pos = DASM_SEC2POS(i);
+    D->sections[i].rbuf = D->sections[i].buf - D->sections[i].pos;
     D->sections[i].ofs = 0;
   }
 }

dynasm/dasm_mips.h

@@ -141,6 +141,7 @@ void dasm_setup(Dst_DECL, const void *actionlist)
   if (D->pclabels) memset((void *)D->pclabels, 0, D->pcsize);
   for (i = 0; i < D->maxsection; i++) {
     D->sections[i].pos = DASM_SEC2POS(i);
+    D->sections[i].rbuf = D->sections[i].buf - D->sections[i].pos;
     D->sections[i].ofs = 0;
   }
 }

dynasm/dasm_ppc.h

@@ -141,6 +141,7 @@ void dasm_setup(Dst_DECL, const void *actionlist)
   if (D->pclabels) memset((void *)D->pclabels, 0, D->pcsize);
   for (i = 0; i < D->maxsection; i++) {
     D->sections[i].pos = DASM_SEC2POS(i);
+    D->sections[i].rbuf = D->sections[i].buf - D->sections[i].pos;
     D->sections[i].ofs = 0;
   }
 }

dynasm/dasm_x86.h

@@ -140,6 +140,7 @@ void dasm_setup(Dst_DECL, const void *actionlist)
   if (D->pclabels) memset((void *)D->pclabels, 0, D->pcsize);
   for (i = 0; i < D->maxsection; i++) {
     D->sections[i].pos = DASM_SEC2POS(i);
+    D->sections[i].rbuf = D->sections[i].buf - D->sections[i].pos;
     D->sections[i].ofs = 0;
   }
 }